Measured intelligence at age ~20 is almost entirely the same as measured intelligence at age ~38, when one ignores the random errors of measurement.
Your intelligence level is not literally immutable, however it is extremely stable after growing up. Here's a SEM for approximately 18 years between tests, at age 20ish and 38ish. The observed r is lower because of measurement error, but SEM says path is .96! (Data from VES.)pic.twitter.com/wLxxmPDrp1
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This data would be more informative if framed in terms of percentiles.
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All this means is, once grown, there is not a lot of leeway for you to take enough brain damage to substantially change your intelligence without actually dying.
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Wonder if you account for Mullainadhan and Shafir’s paper on fluid intelligence affected by various scarcities, poverty/ time/ social relations?https://www.princeton.edu/news/2013/08/29/poor-concentration-poverty-reduces-brainpower-needed-navigating-other-areas-life …
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